Two brothers were charged with sex trafficking children, according to federal court documents unsealed Tuesday.

William Pierce Washington, 36, was arrested by FBI Tuesday morning. His older brother, William Pierce Washington, Jr., 47, was arrested on June 14.

Sharonville police officers responded to a report of a distraught female in a motel's parking lot of April 18, according to the Department of Justice.

According to police, they found a 16-year-old girl who said she had "spent several hours in a motel room smoking crack cocaine and engaged in oral sex with an adult male who physically assaulted her."

After searching the adult male's cell phone, police said they found sexually explicit photos of the victim and text conversations with Washington coordinating payment for sexual activity.

The victim told investigators that she ran away from a foster home and was living with a relative and her boyfriend, Washington, in an Evanston residence owned by Washington, Jr., according to court documents.

While living there the brothers beat and raped the victim, investigators said.

The victim described several instances where she was forced to engage in prostitution, inject with heroin and smoke crack cocaine, documents state.

Police said she was often beaten and on one occasion had a gun held to her head while being raped.

In each instance of prostitution, the two brothers arranged her transportation and the monetary transactions, police said.